380s are generally straight blo back guns while 9mms tend to have delayed bloback. The delayed gun should push a bullet out at a higher velocity han a blowback gun if everything else is the same. A longer barrel should also create higher velocities.

A harder bullet will penetrate farther than a softer one as well.

Basically there are a gazillion different factors that determine how 2 different caliburs will perform in seemingly same circumstances.

Having said that though, we do know that heavy slow bullets outperform fast light bullets in killing people, with a handgun.

For all you naysayers, the .22Lr has killed more people in the US than all other caliburs combined!!!!